Composite electrical lamp and prismatic-glass reflector.



AiENTED-IJU NE 19 1906.

mi 823,619.v

v OJLMYGATT; I COMPOSITE ELECTRICAL. LAMPJAND PRISMATIG GLASS REFLECTOR.

APPLICATION FILED- MAR. 31. 1904,

' ,l fiveh try Otis fi mygato.

' WIN rsmls.xncummmumnmomn c onsi. ew, OF NEWYOR N'. Y]

* Be it known th t I, Orrs-A. MYGAQTT, a cit zen of the United States, res'iding at'New coMPosI E ELECTRICAL LAMPLAVND PRlS M ATIQ- GLA S S REFLECTOR.

Application filed March 31,1904. Serial not 200.981.

I all whom/"it mag concern;

York in the countyof New York and State of New York, have invented certain new and useful Improvements in 'CompositeElectrical Lamps and Prismatic-Glass-Reflectors, of

whic' the following is a specification; My present invention relatesto electriclamps with prismatic-glass reflectors, andcomprises certain improvements the novel features ofwhich are pointed out in the ape The lampembodying pended claims. v M a h my invention is represented 1n ,the drawings, in wh1ch- Figure 1- is aside 'View'of the lamp comlplete; and Fig; Z-isa View" showing the reflector and su' port therefor in cross-section, with the bu b in elevation. s 2

n Myinvention relates to that typeof lamp a "in which the light distribution is-such as to I give.aumformv Illumination over a c rcular area the-diameter of which isJsubstant-ially Ieqnalto the distance of'the illuminated plane fromthe lamp. This result has heretofore beenaccompl'ished by means of areflectorlamp having a spherical bulb, the major porftion ofthe surface of'which is frosted and in which the illuminant or filament is generallyeccentricallylocated. The reflector for such; lamp'is generallyof less maximuin di-ameteri than the maximum diameterofthejbulb and .2 fits closely over'the; unfrostedorcle'ar portion of the bulb." \Niththis construction an accumulationgofheat takes place, so to spealgi This has a tendency to about the filament. v shorten the life of the lampandin some instances to cause an electric discharge to take place in the lamp between the leading-in conductors. When such a' discharge takes place,

the lamp may be destroyed. In or't er to avoid these troubles, which sometimes ap pear, and at 'the same time preserve "the ght distributing characteristicof the lamp and enhance its appearancefl have devised the following construction: Inv lac-e of the closely-fitting metal reflector provide prism-glass reflector 1, in which prisms of the double-reflecting type are located on the outside ofthe reflector, generally as indicated in Fig; 1. This reflector has a grooved upper edue '2 and fitswithin a perforated shell 3, either formed integral wit 1 or spun onto the outershell 4 of the lamp-socket; The shade is held in place by means of inwardly-bent fingers 5, cut from thematen'al of the shell 3.

. s ecification of Letters Patent.

.' Patented June s, 1906.

.An incandescent lamp. is screwed'into the socket, as shown in Fig. 2, andcomprises a spherical bulb 6, frosted u "to a line 7 above t 7 1e center, Fig. '1;.-;-- The fi ament Sis genere ally eccentrically mounted ,so asto be cut by the plane separating the frosted and unfrosted portions of thelb'ulb onglobe. The parts are so arranged that: when the lamp isscrewed into place a space 9 separates/the lamp from theshade and provides a passage for ventilating and cooling currents of air which find their-outlet throughthe perforations 10 in theishell 3. "(T he sha'de l is shaped'f so thatthe parts'adjacent'to then per part of the'lamp conform 1n curvature t erewitlnz thus making-the {space 9 of uniform depth):

throughout aconsiderable: area. Beyond this the shade-flares outwardly, as indicated. The effect ofthe resultant combination of' "a shade of th'e' 'c'haracteriand zcenfiguration. a

'shownijwith a lamp of the type indicated is to f ore described,- but without. involving ,the l'jlOl lblGS heretofore presentin the operation of the lamp; As. the shade conforms in outline to the outline of the upper part of the lam but-allowsa ventilating space between" lam andshade, thereflect'o'r will act as' y efficient y withinits capacity as would a silthe produce alight distribution, such as heretovered or other reflecting surfacedirectly on the bulb, while the accumulation of' heat will belavoi'dodl flliGOlltBf-lllllll of the reflector projecting beyondthe exterior'of the bulb tends to reflectfrayswhich might otherwise. pass obliquely upward and also presents an ornamental andillumin a tin g surface in downward direction when the lamp is sus ended. v "Vhat I cla m herein as new; and esn'e to secure by I:;ette'rs Patent of the United States, is?

x 1. The combinationof a socket, fan inca'n descent him therefor having a spherical bulb Ff glassand-the major portion frosted, a,fila

.a portion 0 the surface ofwhich is of clear ment located eccentrienlly in the bulb of'said lamp, a reflector-holderformed as a er na-v with.

nent part ofthe socl ct, and a prism-g assref .llcctor carrled thereby m proximity to the .bulb of said lamp but'out of cOIitact'there-EO '2. The combination of a socket, an incandesccn t 1:1 mp having a spherical bulb the surface of which is frostct except-over a zone the maximum diameter of which is less than the maxinuun diameter of the bulb, a'filament in said'lamp located in 01' near the'pla'ne separating the frosted from the unfrosted portions of the bulb, and a prism glass reflector carried by the socket and shaped so that a portion thereof conforms in curvature-with 5 the curvature of the bulb leaving a space between while the outer portion of the reflector is flared out from the bulb.

3. The combination of an incandescent lamp havin a spherical bulb frosted except 1o overa zone ess in diameter than the maximum diameter of the bulb, a filament in the bulb located so as to be approximately in the plane separating the frosted and unfrosted in presence of two Witnesses.

OTIS A. MYGATT.

Witnesses:

W. A. DORSY H. E NASON. 

